SBAA347 June   2022 AMC1202 , AMC1300 , AMC1300B-Q1 , AMC1301 , AMC1301-Q1 , AMC1302 , AMC1302-Q1 , AMC1400 , AMC3301 , AMC3301-Q1 , AMC3302 , AMC3302-Q1 , AMC3330 , AMC3330-Q1 , TLV6002 , TLV9002

 

  1.   Design Goals
  2.   Design Description
  3.   Design Notes
  4.   Design Steps
  5.   Design Simulations
  6.   DC Simulation Results
  7.   Closed-Loop AC Simulation Results
  8.   Transient Simulation Results
  9.   Design References
  10.   Design Featured Isolated Amplifier
  11.   Design Alternate Isolated Amplifier

Design Notes

  1. The AMC3301 was selected due to its accuracy, input voltage range, and the single low-side power requirements of the device.
  2. The TLV9002 was selected for its low cost, low offset, small size, and dual channel package.
  3. Select a low impedance, low-noise source for AVDD which supplies the TLV9002 and AMC3301 as well as provides the common-mode voltage for the single-ended output.
  4. For highest accuracy, use a precision shunt resistor with a low temperature coefficient.
  5. Select the current shunt for expected peak input current levels.
  6. For continuous operation, it is recommended that the shunt resistors are not run at more than two-thirds the rated current under normal conditions as per IEEE standards. Further reducing the shunt resistance or increasing the rated wattage may be necessary for applications with stringent power dissipation requirements.
  7. Use the proper resistor divider values to set the common-mode voltage on channel 1 of the TLV9002.
  8. Select the proper values for the gain setting resistors on channel 2 of the TLV9002 so that the single-ended output has an appropriate output swing.